What is the common pressure type thermometer?

Pressure type thermometer generally used in refrigeration or Marine machinery, sometimes home bathroom use pressure type thermometer. So today we speak of what is common pressure type thermometer? As shown in the above, the common pressure type thermometer by a temperature sensor, the pressure of capillary and bourdon tube pressure gauges. If as a gas recharge system, such as nitrogen, it is called a inflatable pressure type thermometer, temperature limit of up to 500 ℃, the relationship between the pressure and temperature is close to linear, but wen package volume is big, thermal inertia is big; If filled with liquids, such as dimethyl benzene, methanol, bulb, temperature measuring range, respectively 40 ℃ to 200 ℃ and - 40℃~170℃； If filled with low boiling point liquid, the saturation vapor pressure should be changed according to the measured temperature, such as acetone, used in 50 ℃ ~ 200 ℃, but due to the saturation vapor pressure and saturated steam temperature is nonlinear relationship, so the thermometer calibration is not uniform. Use pressure type thermometer, also need to clean in time, and regularly test the measured value.